Quote: --- Original message by: helldeath360https://www.youtube.com/watch?v=3SqygQGcPgUThis thread
Is there a tutorial of how to do that? I am new on this. This is a unique bsp I am making... those portals you are talking about... do I add them as a plane and what commando must I write. Or do I have to use scripts?
has some very very good info as well.
You want to create planes that section off large areas of the map. These planes must either be sealed with itself (like a cube), or extend pass the skybox/level geometry. When tool compiles them, it will cull it to an approximate shape of the geometry, and section off the map by that.
You can also use exact portals for interior/exterior sections. If you have any caves or buildings with interiors, seal up the entrance and apply a material called +exactportal to them. This will create a separate section.
Now, when you're not looking into that section of the map the game won't render it. Your map is likely very high-poly, the game can only render so many faces before it runs out of room. Sectioning it off with portals allows the game to only render what it needs to, which will increase performance as well.